obviously the B18B swap is going to be less expensive, when you consider how plentiful and cheap they are compare to the ITR motor- The auto to manal conversion is going to be the same with either motor, since the both came stock with hydro trannies- The real choice is up to you- The B18B is a great candidate for turbocharging right out of the box, while the ITR motor makes 200hp- it's more or less up to you and your wallet :shrug: